GRAVITY stage is used to simulate the deformation of blank under gravity load. The setup is similar to normal sheet forming process simulation. Refer to Section 8.2.4 Forming for description about basic parameters, blank define, tool define, etc. included in Gravity function. In multiple stages analysis, the gravity load can be added to any stage.
The interface of Process definition page is illustrated in Figure 8.2.94. In Process definition page, at least one tool is set as STATIONARY.
Figure 8.2.94 Process definition page
INITIAL VELOCITY OF BLANK: Define the initial velocity of blank.
TOOL CONTROL: Set tool to be Stationary or Non-active.
In Control definition page, the user is allowed to set up basic parameters to control gravity simulation such as General and Analysis method. There are three methods provided here to solve the gravity load: Explicit (Dynamic relaxation), Implicit (Dynamic) and Implicit (Static). It is recommended to use the Implicit (Static) method. Control definition page is illustrated in Figure 8.2.95.
Figure 8.2.95 Control definition page
TERMINATION TIME (ENDTIM): Termination time.
ADVANCED: Advanced setup of basic parameters. The dialog box is illustrated in Figure 8.2.96.
Figure 8.2.96 Basic parameter advanced setup interface
ANALYSIS METHOD:
EXPLICIT (DYNAMIC RELAXATION)
IMPLICIT (DYNAMIC)
IMPLICIT (STATIC)
Once the Explicit (Dynamic relaxation) method is selected, the user can click ADVANCED button to set the advanced parameters for dynamic relaxation. The interface is illustrated in Figure 8.2.97.
Figure 8.2.97 Dynamic relaxation parameter
Once the Implicit (Dynamic) method is selected, the user can click ADVANCED button to set the advanced parameters for it, as illustrated in Figure 8.2.98.
Figure 8.2.98 Implicit parameters